Cavuto spoke directly to the president, telling him he is alienating senators whose support he needs to pass his tax-reform plan.

“Last time I checked, you are the president of the United States, so tweeting out these tacky insults just seems beneath you,” Cavuto said. “You are running out of friends faster than you are running out of time. You might not like Bob Corker, but a lot of senators do, and you need those senators, sir.”

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Trump and Corker have been lobbing insults at each other via Twitter over the past few days. Their feud escalated Tuesday, when the president mocked the senator as “Liddle’ Bob Corker.”

The Failing @nytimes set Liddle' Bob Corker up by recording his conversation. Was made to sound a fool, and that's what I am dealing with!